oneswithout
Oneswithout is a term used in recreational mathematics and programming to describe natural numbers whose decimal representation avoids the digit 1.
Formally, a nonnegative integer n is oneswithout if, when written in base 10, none of its digits
Counting and density: Among d-digit numbers, there are 9^d oneswithout, since each digit has nine allowed choices
Computational aspects and variants: To generate the nth oneswithout in increasing order, one can map the base-9
See also: numbers avoiding specific digits, digit avoidance, and base representations.